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Human IgG subclasses and their relation to carbohydrate antigen immunocompetence
M G Scott1, P G Shackelford, D E Briles
1Department of Pathology, Washington University School of Medicine, St. Louis, MO 63110.
Diagnostic and Clinical Immunology
|January 1, 1988
Summary
Human immunoglobulin G (IgG) responses to bacterial carbohydrates often show isotype restriction, primarily to IgG2. IgG2 deficiency is common in chronic infections, but exceptions exist, highlighting complex regulation and the need for broader antibody testing.
Area of Science:
- Immunology
- Microbiology
- Infectious Diseases
Background:
- Human immunoglobulin G (IgG) responses to carbohydrate antigens, common in bacteria, are typically restricted to the IgG2 subclass.
- This isotype restriction phenomenon has prompted investigations into IgG2 deficiency in individuals prone to infections.
Purpose of the Study:
- To investigate the prevalence and implications of IgG2 deficiency in infection-prone individuals.
- To explore exceptions to isotype restriction in human immune responses to carbohydrate antigens.
- To understand the complexity of IgG subclass regulation in the context of infections.
Main Methods:
- Analysis of IgG subclass levels in patients with chronic bacterial infections.
- Assessment of antibody responses to specific carbohydrate antigens, including phosphocholine.
- Comparison of IgG2 levels and antibody responses in infection-prone individuals.
Main Results:
- IgG2 deficiency is prevalent in patients with chronic bacterial infections, suggesting its utility in patient evaluation.
- Exceptions to IgG isotype restriction in response to carbohydrate antigens were observed.
- Some individuals with poor carbohydrate antigen responses had normal IgG2 levels, indicating complex regulation.
Conclusions:
- IgG subclass measurements are valuable for evaluating infection-prone individuals.
- Human immune responses to carbohydrate antigens are complex and not solely dependent on IgG2 levels.
- Comprehensive evaluation should include IgG subclasses and antibodies to specific carbohydrate antigens like phosphocholine.